WO2009057286A4 - Dispositif pour station mobile de communication radio et procédé de commande de séquence d'étalement de signal de réponse - Google Patents

Dispositif pour station mobile de communication radio et procédé de commande de séquence d'étalement de signal de réponse Download PDF

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Publication number
WO2009057286A4
WO2009057286A4 PCT/JP2008/003070 JP2008003070W WO2009057286A4 WO 2009057286 A4 WO2009057286 A4 WO 2009057286A4 JP 2008003070 W JP2008003070 W JP 2008003070W WO 2009057286 A4 WO2009057286 A4 WO 2009057286A4
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WIPO (PCT)
Prior art keywords
cce
search space
cces
mobile station
pdcch
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PCT/JP2008/003070
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English (en)
Japanese (ja)
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WO2009057286A1 (fr
Inventor
Seigo Nakao
Akihiko Nishio
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Panasonic Corp
Seigo Nakao
Akihiko Nishio
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40590693&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2009057286(A4) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to EP19211371.0A priority Critical patent/EP3633864B1/fr
Priority to CN200880113726.9A priority patent/CN101842999B/zh
Priority to JP2009538925A priority patent/JP5340163B2/ja
Priority to PL17154815T priority patent/PL3182605T3/pl
Application filed by Panasonic Corp, Seigo Nakao, Akihiko Nishio filed Critical Panasonic Corp
Priority to US12/739,687 priority patent/US8526376B2/en
Priority to EP22190492.3A priority patent/EP4120574A1/fr
Priority to EP17154815.9A priority patent/EP3182605B1/fr
Priority to EP08845528.2A priority patent/EP2207271B1/fr
Publication of WO2009057286A1 publication Critical patent/WO2009057286A1/fr
Publication of WO2009057286A4 publication Critical patent/WO2009057286A4/fr
Priority to US13/932,882 priority patent/US8897250B2/en
Priority to US14/522,266 priority patent/US9014132B2/en
Priority to US14/632,483 priority patent/US9559825B2/en
Priority to US15/404,460 priority patent/US10419190B2/en
Priority to US16/546,354 priority patent/US11070342B2/en
Priority to US17/371,269 priority patent/US20210336749A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/009—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location arrangements specific to transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0091—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location arrangements specific to receivers, e.g. format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a wireless communication mobile station apparatus and a response signal spreading sequence control method.
  • ARQ Automatic Repeat Request
  • a wireless communication base station device hereinafter referred to as a base station
  • a wireless communication mobile station device hereinafter referred to as a mobile station
  • Be done the mobile station feeds back a response signal indicating the result of error detection of downlink data to the base station.
  • This response signal is transmitted to the base station using an uplink control channel such as PUCCH (Physical Uplink Control Channel), for example.
  • PUCCH Physical Uplink Control Channel
  • the base station transmits control information for notifying downlink data and uplink data resource allocation results to the mobile station.
  • This control information is transmitted to the mobile station using a downlink control channel such as PDCCH (Physical Downlink Control Channel), for example.
  • PDCCH Physical Downlink Control Channel
  • Each PDCCH occupies one or a plurality of continuous CCEs (Control Channel Elements).
  • the base station generates a PDCCH for each mobile station, allocates a CCE to be occupied in the PDCCH according to the number of CCEs required by control information, maps control information to physical resources corresponding to the allocated CCE, and transmits.
  • a CCE aggregation size For example, for mobile stations located near cell boundaries with poor channel quality, it is necessary to set MCSs with low MCS (Modulation and Coding Scheme) levels in order to satisfy desired reception quality. Therefore, in the base station, PDCCHs that occupy more CCEs (for example, eight CCEs) are transmitted. On the other hand, for mobile stations located near the cell center with good propagation path quality, even if MCS with a high MCS level is set, the required reception quality can be satisfied. Therefore, in the base station, PDCCHs that occupy less CCEs (for example, one CCE) are transmitted.
  • the number of CCEs occupied by one PDCCH is referred to as a CCE aggregation size.
  • the base station simultaneously transmits a plurality of PDCCHs in order to assign a plurality of mobile stations in one subframe.
  • the base station in order to identify the mobile station of the transmission destination of each PDCCH, CRC bits scrambled by the mobile station ID number of the transmission destination are included in control information and transmitted.
  • the mobile station decodes the CCE in which the PDCCH may be arranged, and performs CRC determination after descrambling the CRC bits with the mobile station ID number of the mobile station.
  • the mobile station detects a PDCCH directed to the mobile station by blind decoding multiple PDCCHs included in the received signal.
  • Non-Patent Document 1 a method of limiting CCE to be a target of blind decoding to each mobile station.
  • a CCE region which is a CCE to be subjected to blind decoding
  • the mobile stations in each group may perform blind decoding only on the CCE region allocated to the mobile station, the number of times of blind decoding can be reduced.
  • the CCE region to be subjected to blind decoding by the mobile station is referred to as a search space.
  • CCE and PUCCH are associated on a one-to-one basis in order to efficiently use the downlink communication resources by eliminating the need for signaling from the base station to notify each mobile station of the PUCCH used for transmission of the response signal.
  • Each mobile station can determine, from the CCE corresponding to the physical resource to which the control information to the own station is mapped, the PUCCH to be used for transmission of the response signal from the own station according to this association. Therefore, each mobile station maps the response signal from the own station to the physical resource based on the CCE corresponding to the physical resource to which the control information to the own station is mapped.
  • the base station needs to notify each mobile station of search space information indicating the search space of each mobile station. Therefore, in the above-mentioned prior art, overhead due to notification information is increased.
  • An object of the present invention is to provide a radio communication mobile station apparatus and a response signal spreading sequence control method capable of reducing the number of times of blind decoding in a mobile station without increasing overhead due to notification information.
  • the wireless communication mobile station apparatus is a first control channel that occupies one or more CCEs, and the CCE occupancy number of the first control channel among a plurality of CCE areas that change according to the CFI value.
  • a receiving unit for receiving the first control channel assigned to a corresponding specific CCE region, and a specific second control channel to which a response signal to downlink data is assigned among the plurality of second control channels is the first control channel. It is an association between a determination means based on CCE occupied by a control channel, CCE occupied by the first control channel, and a spreading sequence of the specific second control channel, and changes according to the CFI value
  • a control unit configured to control a spreading sequence of the response signal in accordance with the correspondence.
  • the number of times of blind decoding at the mobile station can be reduced without an increase in overhead due to notification information.
  • Block diagram showing configuration of base station according to Embodiment 1 of the present invention Block diagram showing configuration of mobile station according to Embodiment 1 of the present invention A diagram showing search space information according to Embodiment 1 of the present invention The figure which shows the search space which concerns on Embodiment 1 of this invention.
  • a diagram showing an example of CCE allocation according to Embodiment 1 of the present invention A diagram showing search space information according to the first embodiment of the present invention (when the cell size is large)
  • the figure which shows the search space which concerns on Embodiment 1 of this invention when cell size is large
  • the figure which shows the search space which concerns on Embodiment 2 of this invention The figure which shows the search space which concerns on Embodiment 2 of this invention.
  • FIG. 1 showing a search space according to Embodiment 3 of the present invention
  • Diagram showing a search space according to Embodiment 3 of the present invention (allocation method 2)
  • a diagram showing a search space according to Embodiment 4 of the present invention (CFI 1)
  • FIG. 3 Figure showing PUCCH resource according to Embodiment 5 of the present invention
  • Diagram showing other search spaces (Example 1)
  • Diagram showing other search spaces (example 2)
  • the total number of CCEs to which a PDCCH is allocated is 32 of CCE # 0 to CCE # 31, and the CCE aggregation size of PDCCH is 1, 2, 4, 8. Also, when one PDCCH occupies multiple CCEs, one PDCCH occupies consecutive multiple CCEs.
  • a block-wise spreading code sequence (Zero Auto Correlation (ZAC) sequence is used for primary spreading for PUCCH and a spreading code sequence used for spreading in LB (Long Block) units for secondary spreading
  • ZAC Zero Auto Correlation
  • LB Long Block
  • Block-wise spreading code sequence it is possible to use a sequence that can be separated from each other by different cyclic shift amounts other than the ZAC sequence for the first spreading.
  • a PN sequence such as GCL (Generalized Chirp like) sequence, CAZAC (Constant Amplitude Zero Auto Correlation) sequence, ZC (Zadoff-Chu) sequence, or M sequence or orthogonal gold code sequence may be used for the first spreading. .
  • any sequence orthogonal to each other or any sequence that can be regarded as substantially orthogonal to each other may be used as a block-wise spreading code sequence.
  • Walsh sequences or Fourier sequences can be used for second spreading as block-wise spreading code sequences.
  • the CCE number and the PUCCH number are associated with each other. That is, the PUCCH number is derived from the CCE number used for the PDCCH used for uplink data allocation.
  • Embodiment 1 The configuration of base station 100 according to the present embodiment is shown in FIG. 1, and the configuration of mobile station 200 according to the present embodiment is shown in FIG.
  • FIG. 1 components related to transmission of downlink data closely related to the present invention and reception of response signals to the downlink data in uplink are described. The illustration and description of the components involved in the reception of uplink data are omitted.
  • FIG. 2 shows components related to reception of downlink data closely related to the present invention and transmission of a response signal to the downlink data on the uplink, and is related to transmission of uplink data. Illustration and explanation of parts are omitted.
  • encoding unit 101 receives search space information indicating the definition of a search space determined by the cell size, station environment and the like. Encoding section 101 encodes the input search space information and outputs the result to modulation section 102. Then, modulation section 102 modulates the encoded search space information input from encoding section 101 and outputs the result to allocation section 108.
  • Uplink data or downlink data resource allocation information for each mobile station is input to the encoding / modulation units 103-1 to 103-K.
  • each allocation information is allocated to the PDCCH of the CCE aggregation size required for transmission of the allocation information.
  • encoding / modulation sections 103-1 to 103-K are provided corresponding to up to K mobile stations # 1 to #K.
  • each encoding unit 11 encodes allocation information assigned to the input PDCCH, and outputs the encoded allocation information to each modulation unit 12.
  • each modulation unit 12 modulates each piece of allocation information after coding input from each coding unit 11 and outputs the modulated allocation information to the CCE allocation unit 104.
  • the CCE allocating unit 104 allocates allocation information input from the modulation units 103-1 to 103-K to one of a plurality of CCEs based on search space information. Specifically, the CCE allocation unit 104 allocates the PDCCH to a specific search space corresponding to the CCE aggregation size of the PDCCH among a plurality of search spaces. Then, CCE allocating section 104 outputs allocation information allocated to each CCE to allocation section 108. Details of the CCE allocation method in CCE allocation section 104 will be described later.
  • encoding section 105 encodes input transmission data (downlink data) and outputs the result to retransmission control section 106.
  • encoding section 105 encodes transmission data for each mobile station.
  • retransmission control section 106 holds transmission data after encoding for each mobile station and outputs the transmission data to modulation section 107.
  • Retransmission control section 106 holds transmission data until ACK from each mobile station is input from determination section 117.
  • retransmission control section 106 outputs transmission data corresponding to the NACK to modulation section 107.
  • Modulating section 107 modulates the encoded transmission data input from retransmission control section 106 and outputs the result to allocation section 108.
  • Allocation section 108 allocates allocation information to downlink resources corresponding to allocated CCE among downlink resources allocated for PDCCH, and allocates search space information to downlink resources allocated for broadcast channel, Transmission data is allocated to downlink resources reserved for transmission data. Then, arrangement section 108 outputs the signal after arranging each channel to IFFT (Inverse Fast Fourier Transform) section 109.
  • IFFT Inverse Fast Fourier Transform
  • IFFT section 109 performs IFFT on allocation information, search space information, or a plurality of subcarriers on which transmission data are allocated to generate OFDM symbols, and outputs the OFDM symbols to CP (Cyclic Prefix) addition section 110.
  • CP adding section 110 adds the same signal as that of the tail part of the OFDM symbol to the beginning of the OFDM symbol as a CP.
  • Radio transmitting section 111 performs transmission processing such as D / A conversion, amplification and up conversion on the OFDM symbol after CP addition, and transmits it from antenna 112 to mobile station 200 (FIG. 2).
  • the radio reception unit 113 receives SC-FDMA (Single-Carrier Frequency Division Multiple Access) symbols transmitted from each mobile station via the antenna 112, down-converts the SC-FDMA symbols, and A / D. It performs reception processing such as conversion.
  • SC-FDMA Single-Carrier Frequency Division Multiple Access
  • CP removing section 114 removes the CP attached to the SC-FDMA symbol after reception processing.
  • the determination unit 117 detects a response signal for each mobile station by detecting a correlation peak for each mobile station in each detection window. For example, when a correlation peak is detected in detection window # 0 for mobile station # 0, determination section 117 detects a response signal from mobile station # 0. Then, determination section 117 determines whether the detected response signal is ACK or NACK by synchronous detection using the correlation value of the reference signal, and outputs ACK or NACK for each mobile station to retransmission control section 106. Do.
  • radio reception section 202 receives an OFDM symbol transmitted from base station 100 (FIG. 1) via antenna 201, and performs down conversion, A / D conversion, etc. on the OFDM symbol. Perform reception processing.
  • CP removing section 203 removes the CP attached to the OFDM symbol after reception processing.
  • the separation unit 205 separates the broadcast information arranged in the resource secured in advance for the broadcast channel from the signal input from the FFT unit 204, and outputs the separated broadcast information to the broadcast information decoding unit 206, except for the broadcast information.
  • the information is output to the extraction unit 207.
  • the broadcast information decoding unit 206 decodes the broadcast information input from the separation unit 205, extracts search space information, and outputs the search space information to the extraction unit 207.
  • coding rate information indicating the coding rate of the allocation information that is, information indicating the CCE aggregation size of the PDCCH is input in advance to the extracting unit 207 and the decoding unit 209.
  • extraction section 207 When receiving allocation information, extraction section 207 extracts allocation information from a plurality of subcarriers according to the input CCE aggregation size and search space information, and outputs the extracted allocation information to demodulation section 208.
  • Demodulation section 208 demodulates the allocation information and outputs the result to decoding section 209.
  • determination section 210 determines a PUCCH to be used for transmission of the response signal from the own station from the CCE number corresponding to the subcarrier to which the PDCCH to which the allocation information for the own station is allocated is allocated is assigned.
  • the PUCCH number is output to the control unit 211. For example, when CCE corresponding to a subcarrier to which PDCCH addressed to the own station is allocated is CCE # 0, determination section 210 determines PUCCH # 0 corresponding to CCE # 0 as PUCCH for own station. .
  • determination section 210 determines that CCE # 0 of CCE # 0 to CCE # 3 has the smallest number. It is determined that PUCCH # 0 corresponding to is the PUCCH for its own station.
  • Modulating section 215 modulates the response signal input from CRC section 214 and outputs the result to spreading section 216.
  • Spreading section 216 performs primary spreading of the response signal with the ZAC sequence set by control section 211, and outputs the response signal after primary spreading to IFFT section 217. That is, spreading section 216 performs primary spreading of the response signal using the ZAC sequence of the cyclic shift amount corresponding to the resource selected by control section 211.
  • IFFT section 217 performs IFFT on the response signal subjected to primary spreading, and outputs the response signal subjected to IFFT to CP adding section 218.
  • CP attaching section 218 attaches the same signal as the tail part of the response signal after IFFT as the CP to the head of the response signal.
  • Spreading section 219 secondarily spreads the response signal after CP addition with the block-wise spreading code sequence set by control section 211, and outputs the response signal after second spreading to radio transmitting section 220.
  • the wireless transmission unit 220 performs transmission processing such as D / A conversion, amplification, and up conversion on the response signal after the second spreading, and transmits the signal from the antenna 201 to the base station 100 (FIG. 1).
  • the CCE allocation unit 104 assigns allocation information for each mobile station to the search space corresponding to the CCE aggregation size of the PDCCH to which allocation information for each mobile station is allocated among a plurality of search spaces. assign.
  • CCE allocating section 104 can allocate up to 10 PDCCHs with a CCE aggregation size of 1 to the search spaces of CCE # 0 to CCE # 9. Similarly, CCE allocating section 104 can allocate up to six PDCCHs with a CCE aggregation size of 2 to the search spaces of CCE # 4 to CCE # 15, and CCEs to the search spaces of CCE # 8 to CCE # 23. A maximum of four PDCCHs with an aggregation size of 4 can be allocated, and a maximum of two PDCCHs with a CCE aggregation size of 8 can be allocated to the search spaces of CCE # 16 to CCE # 31.
  • CCE allocation section 104 corresponds to the search space (CCE # 0 to CCE) corresponding to six PDCCHs (CCE aggregation size: 1) and the CCE aggregation size shown in FIG. Of # 9), it is allocated to CCE # 0 to CCE # 5.
  • CCE allocation section 104 corresponds to three PDCCHs (CCE aggregation size: 2) and search spaces (CCE # 4 to CCE) corresponding to the case where CCE aggregation size is 2 shown in FIG.
  • CCE allocating section 104 corresponds to one PDCCH (CCE aggregation size: 8) and a search space (CCE # 16 to CCE) corresponding to the case where CCE aggregation size is 8 shown in FIG. Among # 31), PDCCHs with CCE aggregation sizes of 1, 2 and 4 are allocated to CCE # 24 to CCE # 31 to which no PDCCH is allocated.
  • the mobile station 200 performs PDCCH demodulation, decoding, and blind determination using the search space definition based on the CCE aggregation size.
  • the number of blind determinations of the demodulation unit 208, the decoding unit 209 and the determination unit 210 of the mobile station 200 (FIG. 2).
  • the extraction unit 207 is a signal corresponding to CCE # 0 to CCE # 9 among CCE # 0 to CCE # 31 shown in FIG. Is output to the demodulation unit 208.
  • the target of blind determination when the CCE aggregation size is 1 is limited to the search space corresponding to CCE # 0 to CCE # 9.
  • extraction section 207 only demodulates signals corresponding to CCE # 4 to CCE # 15 among CCE # 0 to CCE # 31 shown in FIG. 4. Output to The same applies to the case where the CCE aggregation size is assumed to be 4 and the case where it is assumed to be 8.
  • each mobile station performs blind decoding using a search space corresponding to the CCE aggregation size. That is, by defining one piece of search space information for each cell, in the mobile station, the base station can perform blind decoding without notifying the search space information for each mobile station.
  • the larger the cell size the higher the proportion of mobile stations that require transmission of assignment information with a low MCS, that is, mobile stations to which a PDCCH with a larger CCE aggregation size is assigned.
  • the smaller the cell size the higher the proportion of mobile stations that can transmit control information with high MCS, that is, mobile stations to which a PDCCH with a smaller CCE aggregation size is assigned.
  • the base station defines different search spaces depending on the cell size. That is, if the cell size is large, a wider search space is defined for larger CCE aggregation sizes and a narrower search space is defined for smaller CCE aggregation sizes. Also, if the cell size is small, a narrower search space is defined for larger CCE aggregation sizes and a wider search space is defined for smaller CCE aggregation sizes.
  • CCE allocating section 104 allocates control information to a specific search space among a plurality of search spaces defined for each cell.
  • CCE allocating section 104 can allocate up to six PDCCHs with a CCE aggregation size of 1 to the search spaces of CCE # 0 to CCE # 5. Similarly, CCE allocating section 104 can allocate up to four PDCCHs with a CCE aggregation size of 2 in the search spaces of CCE # 2 to CCE # 9, and in the search spaces of CCE # 4 to CCE # 23, CCEs A maximum of five PDCCHs with an aggregation size of 4 can be allocated, and a maximum of three PDCCHs with a CCE aggregation size of 8 can be allocated to the search spaces of CCE # 8 to CCE # 31.
  • the number of PDCCHs allocated is smaller in the CCE aggregation size, that is, when the CCE aggregation size is 1 (or the CCE aggregation size is 2) , From 10 (6) to 6 (4).
  • the number of PDCCHs allocated increases from 4 (2) to 5 (3) for larger CCE aggregation sizes, that is, CCE aggregation size 4 (or CCE aggregation size 8) . That is, in the CCE allocation unit 104, as the cell size is larger, the PDCCHs of larger CCE aggregation size are more, and therefore, more PDCCHs of larger CCE aggregation size can be allocated. In other words, the CCE allocation unit 104 can allocate more PDCCHs with smaller CCE aggregation sizes because the smaller the cell size, the more PDCCHs with smaller CCE aggregation sizes.
  • the number of times of blind decoding can be reduced. Further, in each mobile station, since the search space is specified based on the search space information broadcasted from the base station to all the mobile stations, new notification information for each mobile station becomes unnecessary. Therefore, according to the present embodiment, the number of times of blind decoding can be reduced without an increase in overhead due to notification information.
  • the CCE aggregation size may be determined for each mobile station. For example, a mobile station located near a cell edge has a high propagation path quality, so the rate of transmitting at a lower MCS is high. Therefore, the CCE aggregation size of the mobile station located near the cell edge is limited to 4 or 8. In addition, since the mobile station located at the cell center has a good channel quality, the rate of transmitting at a higher MCS is high. Therefore, the CCE aggregation size of the mobile station located near the cell center is limited to 1 or 2. This makes it easier to further specify the search space, and therefore the number of times of blind decoding at the mobile station can be further reduced.
  • the present invention is not limited to the cell size.
  • the search is performed according to the distribution of mobile stations in the cell. You may set the definition of space.
  • the allocation information is allocated to a specific search space configured by CCEs whose CCE numbers are smaller as the CCE aggregation size is larger.
  • a search space configured of 16 CCEs of CCE # 0 to CCE # 15 is defined, and when the CCE aggregation size is 4, A search space consisting of 16 CCEs of CCE # 8 to CCE # 23 is defined, and if the CCE aggregation size is 2, a search space consisting of 12 CCEs of CCE # 16 to CCE # 27 is defined.
  • the CCE aggregation size is 1, a search space configured of ten CCEs of CCE # 22 to CCE # 31 is defined.
  • the CCE allocation unit 104 of the base station 100 five CCE aggregation sizes of 1 PDCCH, 3 CCE aggregation sizes of 2 PDCCH, 2 CCE aggregation sizes of 4 PDCCH, 1 CCE A case will be described where PDCCHs with an aggregation size of 8 are allocated.
  • PDCCHs with a CCE aggregation size of 8 are allocated to CCE # 8 to CCE # 11 and CCE # 12 to CCE # 15 to which no PDCCH is allocated.
  • CCE allocating section 104 is configured to receive three PDCCHs (CCE aggregation size: 2) and a search space (CCE # 16 to CCE # 27) corresponding to the case where the CCE aggregation size is 2.
  • PDCCHs with CCE aggregation sizes of 8 and 4 are allocated to CCE # 16 and CCE # 17, CCE # 18 and CCE # 19, and CCE # 20 and CCE # 21, respectively. Then, as shown in FIG.
  • CCE allocating section 104 sets five PDCCHs (CCE aggregation size: 1) in a search space (CCE # 22 to CCE # 31) corresponding to the case where CCE aggregation size is 1. Among them, CCE # 22 to CCE # 26 are assigned. Further, CCEs other than CCEs used for PDCCH, that is, unused CCEs are grouped in CCE # 27 to CCE # 31 near the end among CCE # 0 to CCE # 31.
  • the CCE allocating unit 104 can allocate a plurality of PDCCHs to a plurality of continuous CCEs without generating unused CCEs.
  • the CCE numbers are used in order from the smallest CCE number, and when unused CCEs occur, the CCE numbers tend to be grouped into CCEs near the end.
  • CCE allocating section 104 sequentially transmits CCEs from CCEs immediately after CCE to which PDCCH with larger CCE aggregation size is allocated. It is possible to allocate PDCCH of aggregation size. Therefore, as in the first embodiment, PDCCHs of other CCE aggregation sizes are already allocated, so that CCEs can be prevented from becoming unusable, and PDCCHs can be allocated efficiently.
  • the base station since unused CCEs are gathered near the end of the CCE number, for example, the base station reduces the number of CCEs actually allocated to PDCCH and transmits (in the above example, reduces to 27 CCEs) and transmits Thus, resources (in the above example, five CCEs of CCE # 27 to CCE # 31) freed thereby can be effectively used as data resources.
  • allocation information is allocated to a specific search space configured by CCEs of which CCE numbers are smaller as the CCE aggregation size is larger.
  • ⁇ Allocation method 1> In this allocation method, in a plurality of CCEs constituting a specific search space, uplink allocation information for notifying of downlink allocation results is allocated in ascending order from the CCE with the smallest CCE number, and uplink for notifying uplink allocation results. Allocation information is allocated in descending order from the CCE with the largest CCE number.
  • CCE # 31 is assigned in descending order from CCE # 31 which is the largest CCE. That is, CCE allocating section 104 allocates downlink allocation information in the order of CCE # 31 to CCE # 22. The same applies to the case where the CCE aggregation size is 2, 4 or 8.
  • CCE # 22 to CCE # 31 shown in FIG. 9 CCE # 22 has the highest usage frequency as PDCCH of downlink allocation information, and CCE # 31 has the highest usage frequency as PDCCH of uplink allocation information.
  • CCE # 22 is the least frequently used as PDCCH of uplink allocation information. That is, in CCE # 22 to CCE # 31 shown in FIG. 9, CCE # 22 having the lowest frequency of use as PDCCH of uplink allocation information is used as PDCCH of downlink allocation information, and PDCCH of downlink allocation information is used.
  • the least frequently used CCE # 31 is used as a PDCCH for uplink allocation information.
  • the downlink can be obtained while obtaining the same effect as that of the second embodiment.
  • a plurality of CCEs can be efficiently used for allocation information and uplink allocation information.
  • each search space is formed of a sequence of CCEs symmetrical with respect to the center of CCE # 0 to CCE # 31 (between CCE # 15 and CCE # 16).
  • CCE allocating section 104 allocates downlink allocation information in ascending order from the CCE with the smallest CCE number in each search space, and allocates uplink allocation information in the same manner as in Allocation Example 1.
  • CCE numbers in each search space are allocated in descending order from the CCE with the largest. That is, among CCE # 0 to CCE # 31 shown in FIG. 10, while the search space (CCE # 0 to CCE # 15) having a CCE number smaller than the center is used more frequently as PDCCH of downlink allocation information, In the search space (CCE # 16 to CCE # 31) whose CCE number is larger than the center, the usage frequency of uplink allocation information as PDCCH becomes high.
  • blind decoding can be performed without an increase in overhead due to notification information.
  • the number of times can be reduced.
  • uplink assignment information is assigned in ascending order from the CCE with the smallest CCE number among a plurality of CCEs constituting a specific search space, and downlink assignment information is assigned from the CCE with the largest CCE number.
  • Embodiment 4 In the present embodiment, assignment information is assigned to a specific search space that is shifted according to the value of CFI (Control Format Indicator).
  • CFI Control Format Indicator
  • the total number of CCEs N CCE (3) 32.
  • the start position of the search space corresponding to CCE aggregation size 4 n CCE4 (3) 8
  • the start position of the search space corresponding to CCE aggregation size 2 n CCE2 (3) 16
  • the determination unit 210 (FIG. 2) of the mobile station 200 is similar to the CCE allocation unit 104 only in allocation information allocated to a specific search space to be shifted according to the value of CFI notified from the base station 100. A blind decision is made as to whether or not it is assignment information for the own station. That is, even when the CFI changes, the definition of the common search space can always be obtained between the CCE allocation unit 104 of the base station 100 and the determination unit 210 of the mobile station 200.
  • the mobile station defines the search space using the search space definition broadcasted from the base station to each mobile station even when the CFI value changes. change.
  • the mobile station defines an optimal search space according to the value of CFI without increasing overhead due to further notification information. Therefore, according to this embodiment, even when CFI fluctuates, the same effect as that of Embodiment 2 can be obtained.
  • the mobile station When associating a CCE with a PUCCH, the mobile station sets the PUCCH corresponding to the CCE of the smallest number among the one or more CCEs constituting the PDCCH in which allocation information for the own station is arranged with the PUCCH for the own station judge. Therefore, when PUCCHs are associated on a one-to-one basis for all CCEs, PUCCHs that are not actually used are generated when CCE aggregation is performed, resulting in poor resource usage efficiency.
  • the CCE corresponding to the physical resource for which allocation information for the mobile station is allocated is CCE # 0 to CCE # 3
  • PUCCH # 0 corresponding to is the PUCCH for its own station. That is, the three PUCCHs PUCCH # 1 to PUCCH # 3 other than the PUCCH for the own station are no longer used and are wasted.
  • the mobile station sets the number of CCEs corresponding to the CCE aggregation size to a plurality of CCEs configuring PDCCH belonging to each search space.
  • Match 1 PUCCH to.
  • one PUCCH may be associated with eight CCEs, and a plurality of CCEs configuring a PDCCH with a CCE aggregation size of 4
  • one PUCCH may be associated with four CCEs. That is, one PUCCH may be associated with n CCEs for a plurality of CCEs constituting a PDCCH with a CCE aggregation size of n.
  • Determination section 210 (FIG. 2) of mobile station 200 according to this embodiment is the same as that of Embodiment 4 according to the value of CFI, for a specific PUCCH to which a response signal to downlink data is assigned among a plurality of PUCCHs. The determination is made based on the CCEs occupied by the PDCCH allocated to a specific search space corresponding to the CCE aggregation size of the PDCCH to which allocation information directed to the own station is allocated among a plurality of search spaces that change accordingly.
  • n CCE2 (3) 16
  • n CCE1 (3) 22
  • the control unit 211 secures a PUCCH resource associated with the minimum number of CCEs occupied by the PDCCH with the smallest CCE aggregation size among the plurality of PUCCHs.
  • the search space start position corresponding to the CCE aggregation size of 4 n CCE 4 (3) 8 (CCE # 8) to the search space corresponding to the CCE aggregation size of 2
  • the CCE aggregation size having the smallest CCE aggregation size is the CCE of the CCEs that respectively configure two PDCCHs having an aggregation size of 4
  • Two PUCCH resources are associated with minimum numbers CCE # 8 and CCE # 12.
  • Three PUCCH resources are associated with the minimum CCE # 16, CCE # 18, and CCE # 20 of the CCEs to be transmitted.
  • CCE Ten PUCCH resources are associated with CCE # 22 to CCE # 31 that respectively configure ten PDCCHs with an aggregation size of one.
  • one PUCCH resource is associated with eight CCEs in the area less than the start position n CCE4 (i). Moreover, the start position n CCE4 (i) above, and, in the region of less than the start position n CCE2 (i), 1 single PUCCH resource is associated with respect to four CCE. Similarly, in the area above the start position n CCE2 (i) and below the start position n CCE1 (i), one PUCCH resource is associated with two CCEs. Then, in the area above the start position n CCE1 (i), one PUCCH resource is associated with one CCE.
  • control unit 211 controls the PUCCH resource of the response signal according to the association between the CCE and the PUCCH resource, which changes according to the value of CFI, based on the search space information broadcasted from the base station 100.
  • PUCCH resource a physical resource having a smaller PUCCH number is preferentially associated with the CCE.
  • PUCCH numbers are defined by cyclic shift amounts (0 to 11) of the ZAC sequence and sequence numbers (0 to 2) of the block-wise spreading code sequence.
  • PUCCH resources associated with CCEs are as shown in FIG. Specifically, as shown in FIG. 15, the PUCCH number associated with CCE # 0 is defined by ZAC sequence # 0 and block-wise spreading code sequence # 0, and PUCCH associated with CCE # 8. The number is defined by ZAC sequence # 0 and block-wise spreading code sequence # 2. The present invention is not limited to these sequence lengths.
  • CFI 2
  • CCE # 0 to CCE # 7 the minimum number CCE # 0 and CCE # 4 of the CCEs configuring the PDCCH with CCE aggregation size 4 and PUCCH respectively
  • CCE # 8 to CCE # 13 resources are associated, and PUCCH resources are associated with minimum numbers CCE # 8, CCE # 10, and CCE # 12 of CCEs configuring PDCCH with CCE aggregation size 2 and CCE
  • PUCCH resources are associated with CCE # 14 to CCE # 23 configuring a PDCCH with a CCE aggregation size of 1, respectively.
  • PUCCH resources associated with CCE numbers are as shown in FIG.
  • the attached PUCCH resources have been reduced.
  • PUCCH resources shown in FIG. 15 and PUCCH resources shown in FIG. 16 are associated with different CCE numbers.
  • PUCCH resources are defined based on the correspondence between ZAC sequences and block-wise spreading code sequences shown in FIGS. 15, 16 and 17.
  • the present invention is not limited to this.
  • the present invention is not limited to the correspondence between the ZAC sequence and the block-wise spreading code sequence shown in FIGS.
  • resources other than the cyclic shift amount of the ZAC sequence and the block-wise spreading code sequence may be used as the PUCCH resource.
  • the PUCCH resource may be a resource distinguished by frequencies such as subcarriers, or a resource distinguished by times such as SC-FDMA symbols.
  • the total number of CCEs that can be used in one subframe is the system bandwidth, the number of OFDM symbols that can be used as CCEs, downlink / uplink It changes with the total of the control signal (for example, ACK / NACK etc. with respect to uplink data etc.) used for the notification of those other than the resource allocation result of channel data.
  • PUCCH used by description of the said embodiment is a channel for feeding back ACK or NACK, it may be called an ACK / NACK channel.
  • the CCE and PUCCH are associated with each other.
  • the present invention is also applicable to CCE and PHICH (Physical Hybrid ARQ Indicator Channel) as described above. You can get the effect of Here, a response signal to uplink data is assigned to PHICH.
  • the present invention can be practiced in the same manner as described above even when the search space definition shown in FIG. 18 is used.
  • a plurality of mobile stations are grouped, and a search space used for each group and a search space used for each CCE aggregation size are used in combination.
  • search spaces corresponding to each CCE aggregation size are configured not to overlap each other. As a result, the same effect as described above can be obtained, and since different search spaces do not overlap, resources to be secured for PUCCH resources can be further reduced.
  • the present invention can be implemented in the same manner as described above even in the case where control information other than the response signal is fed back.
  • the mobile station may be referred to as a terminal station, UE, MT, MS, STA (Station).
  • a base station may be referred to as Node B, BS, or AP.
  • subcarriers may be referred to as tones.
  • the CP may be referred to as a guard interval (GI).
  • the CCE number may be referred to as a CCE index (CCE Index).
  • the method of error detection is not limited to CRC.
  • the present invention relates to transmissions other than OFDM and SC-FDMA. It is applicable also using a system.
  • the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible.
  • a programmable field programmable gate array FPGA
  • a reconfigurable processor that can reconfigure connection and setting of circuit cells in the LSI may be used.
  • the present invention can be applied to mobile communication systems and the like.

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  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif pour station mobile de radio communication permettant de réduire le nombre d'opérations de décodage aveugle sans augmentation des frais généraux liés aux informations de compte-rendu. Ce dispositif est constitué comme suite: unité d'évaluation (210) appréciant un PUCCH (canal de commande de liaison montante physique) particulier auquel un signal de réponse correspondante aux données de ligne aval doit être attribué parmi une pluralité de PUCCH, selon un CCE occupé par un PDCCH (canal de commande de liaison descendante physique) attribué à un espace de recherche particulier correspondant à la taille d'agrégation CCE du PDCCH auquel des informations d'attribution destinées à la station locale sont attribuée parmi les espaces de recherche qui changent en fonction de la valeur CFI; et unité de commande (21) qui commande une valeur de décalage cyclique d'une séquence ZAC (autocorrélation zéro) du signal de réponse et une séquence de code d'étalement de type bloc selon une correspondance entre le CCE occupé par le PDCCH attribué à un espace de recherche particulier et une ressource PUCCH particulière, correspondance qui change en fonction de la valeur CFI.
PCT/JP2008/003070 2007-10-29 2008-10-28 Dispositif pour station mobile de communication radio et procédé de commande de séquence d'étalement de signal de réponse WO2009057286A1 (fr)

Priority Applications (14)

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JP2009538925A JP5340163B2 (ja) 2007-10-29 2008-10-28 端末装置、応答信号送信方法及び集積回路
EP17154815.9A EP3182605B1 (fr) 2007-10-29 2008-10-28 Espace de recherche basé sur la dimension d'agrégation des éléments de commande de canal
EP08845528.2A EP2207271B1 (fr) 2007-10-29 2008-10-28 Dispositif pour station mobile de communication radio et procédé de commande de séquence d'étalement de signal de réponse
PL17154815T PL3182605T3 (pl) 2007-10-29 2008-10-28 Przestrzeń wyszukiwania na podstawie rozmiaru agregacji elementów kanału sterowania
CN200880113726.9A CN101842999B (zh) 2007-10-29 2008-10-28 无线通信移动台装置和响应信号扩频序列控制方法
US12/739,687 US8526376B2 (en) 2007-10-29 2008-10-28 Radio communication mobile station device and response signal spread sequence control method
EP22190492.3A EP4120574A1 (fr) 2007-10-29 2008-10-28 Transmission de liaison montante
EP19211371.0A EP3633864B1 (fr) 2007-10-29 2008-10-28 Attribution de ressources pour ack/nack de liaison montante
US13/932,882 US8897250B2 (en) 2007-10-29 2013-07-01 Terminal apparatus and method for transmitting a response signal at a terminal
US14/522,266 US9014132B2 (en) 2007-10-29 2014-10-23 Communication apparatus and method for receiving a response signal
US14/632,483 US9559825B2 (en) 2007-10-29 2015-02-26 Integrated circuit for reducing blind decoding processes at a mobile communication device
US15/404,460 US10419190B2 (en) 2007-10-29 2017-01-12 Terminal apparatus and method for transmitting a response signal at a terminal
US16/546,354 US11070342B2 (en) 2007-10-29 2019-08-21 Terminal apparatus and method for transmitting a response signal at a terminal
US17/371,269 US20210336749A1 (en) 2007-10-29 2021-07-09 Terminal apparatus and method for transmitting a response signal at a terminal

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JP2007-280921 2007-10-29

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US12/739,687 A-371-Of-International US8526376B2 (en) 2007-10-29 2008-10-28 Radio communication mobile station device and response signal spread sequence control method
US13/932,882 Continuation US8897250B2 (en) 2007-10-29 2013-07-01 Terminal apparatus and method for transmitting a response signal at a terminal

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JP (2) JP5340163B2 (fr)
CN (2) CN101842999B (fr)
ES (4) ES2928770T3 (fr)
HK (1) HK1206505A1 (fr)
HU (2) HUE060549T2 (fr)
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